Two-dimensional Gaussian Plasma Lenses: a Wave Optics Analysis

Details Two-dimensional Gaussian Plasma Lenses: a Wave Optics Analysis Two-dimensional Gaussian Plasma Lenses: a Wave Optics Analysis

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545319s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #453.19; Bulletin of the American Astronomical Society, Vol. 42, p.465

Physics

Optics

Scientific paper

Detection of long-wavelength gravitational waves using high-precision pulsar timing requires careful correction for interstellar propagation delays. As part of a program to correct for such delays at the 100 ns level, we are investigating the effects of structured plasma inhomogeneities (lenses) in the ISM. Clegg, Fey, & Lazio (1998) investigated 1d Gaussian lenses using ray optics techniques. We have performed a wave optics analysis on 2d versions of these lenses. In contrast to their findings, we do not find a double caustic structure or any simple pattern that could be used to disentangle lens size and lens distance effects. This difference is due to the disregard of phase information in the CFL treatment, which found caustic structures that do not exist in the wave optics treatment. We discuss future work that may allow a better discrimination of 2d lenses through the analysis of pulsar dynamic spectra.

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